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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"BinaryFormatter serialization and deserialization warning which throws an error in .net8","articleBody":"### Environment\r\n\r\n-   Pythonnet version: 3.0.3\r\n-   Python version: 3.9\r\n-   Operating System: Windows 11\r\n-   .NET Runtime: .net8 (release version 16/11/23)\r\n\r\n### Details\r\n\r\n-   When shutting down the the PythonEngine via a Dispose method on the impermentation class, the error occurs at the PythonEngine.Shutdown(); method and throws the error System.NotSupportedException: BinaryFormatter serialization and deserialization are disabled within this application (see trace below). The same code worked in .net7 without any issues, the error message leads to this description\r\n- \r\n- https://learn.microsoft.com/en-us/dotnet/standard/serialization/binaryformatter-security-guide\r\n- \r\n- Proir to the Shutdown error the pythonnet works correctly and calls python functions and returns the expected results\r\n- \r\n- The resolution is to add \u003cEnableUnsafeBinaryFormatterSerialization\u003etrue\u003c/EnableUnsafeBinaryFormatterSerialization\u003e to the .csproj file\r\n-     \u003cPropertyGroup\u003e\r\n        \u003cTargetFramework\u003enet8.0\u003c/TargetFramework\u003e\r\n        \u003cEnableUnsafeBinaryFormatterSerialization\u003etrue\u003c/EnableUnsafeBinaryFormatterSerialization\u003e\r\n       \u003c/PropertyGroup\u003e\r\n\r\n\r\n\r\n    _TODO_\r\n\r\n\r\n- _logger.Log is to to trace the point of failure  \r\n- _logger.Log(LogLevel.Error, \"Shutting down Python engine\"); runs \r\n- it crashes at the PythonEngine.Shutdown(); method \r\n- _logger.Log(LogLevel.Error, \"Python engine shut down\"); does not run\r\n\r\n\r\n    private void Dispose(bool disposing)\r\n    {\r\n        _logger.Log(LogLevel.Error, \"Dispose\");\r\n        if (_disposed) return;\r\n        if (disposing)\r\n        {\r\n            _logger.Log(LogLevel.Error, \"Shutting down Python engine\");\r\n            PythonEngine.Shutdown();\r\n            _logger.Log(LogLevel.Error, \"Python engine shut down\");\r\n        }\r\n        _disposed = true;\r\n    }\r\n\r\n```python\r\n    print('TODO')\r\n```\r\n\r\n-   System.NotSupportedException: BinaryFormatter serialization and deserialization are disabled within this application. See https://aka.ms/binaryformatt...\r\n\r\nSystem.NotSupportedException\r\nBinaryFormatter serialization and deserialization are disabled within this application. See https://aka.ms/binaryformatter for more information.\r\n   at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph)\r\n   at Python.Runtime.RuntimeData.Stash()\r\n   at Python.Runtime.Runtime.Shutdown()\r\n   at Python.Runtime.PythonEngine.Shutdown()\r\n   at EcgAi.Training.Infrastructure.Python.PythonEnvironment.Dispose(Boolean disposing) in C:\\Data\\Rider\\EcgAi.Training\\Src\\EcgAi.Training.Infrastructure.Python\\PythonEnvironment.cs:line 113\r\n   at EcgAi.Training.Infrastructure.Python.PythonEnvironment.Dispose() in xxxxxxxxxxxxxxxxxxxxxxxxx\r\n\r\n```python\r\n    print('TODO')\r\n```\r\n","author":{"url":"https://github.com/RobertClapham","@type":"Person","name":"RobertClapham"},"datePublished":"2023-11-16T12:01:41.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":14},"url":"https://github.com/2282/pythonnet/issues/2282"}